Current nested output handler implementation has some problems.

User can accidentally delete zlib output handler. This may lead to
SIGPIPE and/or no output after deletion. (Bug#14226) Other
internal handler may also be deleted. (mbstring output conversion,
trans sid handler, iconv, anything else?)

Make 2 output handler lists for internal(module) and user use.
Disallow deleting internal output handlers from script.

Side Effect:
User may *not* able to turn off output buffering using
ob_end_clean()/ob_end_flush(). (ob_implicit_flush() can be used,

If nobody objects or writes patch, I'll write one.
If you have comments, please let me know before I start coding.
(I'll wait about a week for feedback at least)

Thank you for your comments.

Yasuo Ohgaki

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